How do you say your brothers are twins in french?

There are a couple of ways to say your brothers are twins in French, depending on the context:

Formal:

* Mes frères sont jumeaux. (My brothers are twins.)

Informal:

* J'ai deux frères jumeaux. (I have two twin brothers.)

You can also specify if they are identical or fraternal twins:

* Mes frères sont jumeaux identiques. (My brothers are identical twins.)

* Mes frères sont jumeaux fraternels. (My brothers are fraternal twins.)